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weeeeeb [17]
3 years ago
9

Which is an equation for the given word problem? After Joel deposits $25.50 into his savings account, his balance is $275.00. Wh

ich equation can be used to find the amount, n, in his account before he made the deposit?
a. 25.50 – n = 275.00
b. n – 275.00 = 25.50
c. n + 275.00 = 25.50
d. 25.50 + n = 275.00
Mathematics
1 answer:
kirill [66]3 years ago
4 0
The answer is d. Normally I would solve this as 275-25.50=n. If you move 25.50 to the other side you get 275=n+25.50.
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a. If the area of the tiles is greater than or equal to the area of all the rooms.

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4 0
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Five thousand tickets are sold at​ $1 each for a charity raffle. Tickets are to be drawn at random and monetary prizes awarded a
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Answer:

the expected value of this raffle if you buy 1​ ticket = -0.65

Step-by-step explanation:

Given that :

Five thousand tickets are sold at​ $1 each for a charity raffle

Tickets are to be drawn at random and monetary prizes awarded as​ follows: 1 prize of ​$500​, 3 prizes of ​$300​, 5 prizes of ​$50​, and 20 prizes of​ $5.

Thus; the amount and the corresponding probability can be computed as:

Amount                            Probability

$500 -$1 = $499                1/5000

$300 -$1 = $299                3/5000

$50 - $1 = $49                     5/5000

$5 - $1 = $4                      20/5000

-$1                                   1- 29/5000 = 4971/5000

The expected value of the raffle if 1 ticket is being bought is  as follows:

E(x) = \sum x  * P(x)

E(x) = (499 * \dfrac{1}{5000} + 299 *\dfrac{3}{5000} + 49 *\dfrac{5}{5000} + 4 * \dfrac{20}{5000}  + (-1 * \dfrac{4971}{5000} ))

E(x) = (0.0998 + 0.1794+0.049 + 0.016  + (-0.9942 ))

E(x) = (0.3442 -0.9942 )

\mathbf{E(x) = -0.65}

Thus; the expected value of this raffle if you buy 1​ ticket = -0.65

7 0
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